KoshlyakovV. N. “On Stability of Motion of a Symmetric Body Placed on a Vibrating Base”. Ukrains’kyi Matematychnyi Zhurnal 47, no. 12 (December 25, 1995): 1661–1666. Accessed October 6, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5559.